disable uart0 uart7 uart9

hc

2023-11-22 983d7f83616922a6439b4352d1b3af488ee27f95

 kernel/include/linux/delay.h
..
..
@@ -64,4 +64,10 @@
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 	msleep(seconds * 1000);
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 }
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+#ifdef CONFIG_PREEMPT_RT_FULL
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+extern void cpu_chill(void);
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+#else
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+# define cpu_chill()	cpu_relax()
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+#endif
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+
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 #endif /* defined(_LINUX_DELAY_H) */